
@mixin calcW($w){
    width: calc(100% - #{$w});
    width: -moz-calc(100% - #{$w});
    width: -webkit-calc(100% - #{$w});
}
@mixin calcH($h){
    height: calc(100% - #{$h});
    height: -moz-calc(100% - #{$h});
    height: -webkit-calc(100% - #{$h});
}

@mixin calc($width,$height){
    top: calc(50% - #{$height / 2});
    top: -moz-calc(50% - #{$height / 2});
    top: -webkit-calc(50% - #{$height / 2});
    left: calc(50% - #{$width / 2});
    left: -moz-calc(50% - #{$width / 2});
    left: -webkit-calc(50% - #{$width / 2});
}

@mixin border-radius($value){
    -webkit-border-radius: $value;
    -moz-border-radius: $value;
    -ms-border-radius: $value;
    -o-border-radius: $value;
    border-radius: $value;
}
@mixin margin($margin){
    -webkit-margin: $margin;
    -moz-margin: $margin;
    -ms-margin: $margin;
    -o-margin: $margin;
    margin: $margin;
}